Merge pull request #18 from Minalien/master

Implemented combat system.
Merge pull request #19 from Minalien/master

Updated assets.
Updated "Awesome Unit" test prefab to be more balanced to show off the combat system. Note that this unit is not going to be used in-game, it exists just to test things.

Signed-off-by: Ken "Minalien" Murray <minalien@gmail.com>
Pulled in assets from Austin's demo level.

Signed-off-by: Ken "Minalien" Murray <minalien@gmail.com>
Added components for gameplay demo.

Signed-off-by: Ken "Minalien" Murray <minalien@gmail.com>